Honda EU2200i / EU7000iS / EG4000 / EU3000iS error codes
15 codes from the official Honda manual (EB2800i), each with the manual page. For 8 of them the manual says to contact an authorized service dealer.
Applies to: Honda EU2200i, Honda EU7000iS, Honda EG4000, Honda EU3000iS, Honda EG2800i, Honda EB2800i.
| Code | What it means | What to do | Service | Manual |
|---|---|---|---|---|
| AC CIRCUIT PROTECTOR AC Circuit Protector switched OFF | Switches to OFF automatically when there is a short circuit or a significant overload at the 20A receptacles. | Check that the appliance works properly and does not exceed the circuit's rated load capacity before pushing the protector to reset it ON. | owner | p. 6 |
| CO ALARM CO ALARM indicator flashing | CO-MINDER detected a high carbon monoxide concentration and stopped the engine. The indicator flashes for about five minutes. | Move the generator to fresh air, away from the source of carbon monoxide, and not in an enclosed area. Press the CO-MINDER reset button, then restart using the standard procedure. If the indicator stays on after reset, the sensor may be near end of life. | owner | p. 7 |
| FAULT/CO SENSOR LIFE CO sensor life (end of useful life) | The CO-MINDER sensor is reaching the end of its useful life. Flashing once every 4 seconds means about 6 months to 1 year remains. Flashing once every 2 seconds means about 6 months or less remains. | Contact an authorized Honda Power Equipment dealer for CO sensor replacement. | dealer | p. 7 |
| Oil Alert Indicator/Check Oil Alert indicator/check (red) | Crankcase oil level has fallen below a safe limit. The Oil Alert system automatically stops the engine to prevent damage, while the engine switch stays in the ON position. | Check the engine oil level before troubleshooting other areas. Add oil as needed. | owner | p. 7 |
| Overload Alarm Overload alarm (red) | Generator is overloaded (over 2.8 kVA), a connected appliance has a short circuit, or the inverter is overheated. Output shuts off after about 4-10 seconds while the engine keeps running. A brief alarm when a motor starts is normal. | Stop the engine and investigate. Determine whether the cause is a short circuit in an appliance or an overload, correct it, then restart. If the alarm stays on during motor startup, consult your generator dealer. | owner | p. 7 |
| End of serviceable life GFCI LED on: end of serviceable life | The GFCI LED is on, indicating the GFCI has reached the end of its serviceable life. | This section gives no specific repair step for this state. If the GFCI does not function as described in the operation check, contact an authorized Honda generator dealer. | dealer | p. 9 |
| Internal malfunction GFCI LED flashing: internal malfunction | The GFCI LED is flashing, indicating an internal malfunction in the GFCI. | If the GFCI fails the test, the generator must be repaired by an authorized Honda servicing dealer before use. | dealer | p. 9 |
| Leakage detected GFCI LED on: leakage detected | The GFCI LED is on and the RESET button has extended, indicating a ground-fault leakage was detected at the protected receptacle. | Unplug all appliances from the GFCI receptacle and press the RESET button. If the GFCI cannot be reset, it is faulty; contact an authorized Honda generator dealer. If the reset extends only when an appliance is running, repair or replace the faulty tool, appliance, or cord after confirming the GFCI passes the check. | dealer | p. 9 |
| Oil Alert Oil Alert system | The Oil Alert system automatically stops the engine before the oil level falls below safe limits. A low oil level can cause this shutdown. | Check the oil level and add oil as necessary. Turn the engine switch OFF and then ON, then restart the engine. | owner | p. 12 |
| Overload Overload alarm | The AC output indicator is OFF and the overload alarm is ON, meaning the generator's AC output has been cut off because of an overload condition. | Check the AC load. Stop and restart the engine. Check the cooling air inlet and stop and restart the engine. Replace or repair any faulty power tool or appliance. If the generator is faulty, take it to an authorized Honda servicing dealer or refer to the shop manual. | dealer | p. 15 |
| CO ALARM CO-MINDER indicators flashing | The CO-MINDER system has detected high carbon monoxide levels around the generator and automatically stops the engine. Flashing CO ALARM indicator with a no-start may also indicate a CO-MINDER malfunction or a sensor at end of life. | Move the generator to a well-ventilated outdoor location away from windows, doors, and vents. Press the CO-MINDER reset button to restart the engine. If the engine will not start and the CO ALARM indicator keeps flashing after relocation, consult an authorized Honda Power Equipment dealer. | dealer | p. 16 |
| Oil Alert/Check Oil Alert/Check Indicator (red) | Engine oil in the crankcase is insufficient. Before the oil falls below a safe limit, the red indicator comes on and the Oil Alert system automatically stops the engine. | Check the engine oil level (see page 30) before troubleshooting other areas. | owner | p. 26 |
| OIL OIL ALERT/CHECK | Crankcase oil is insufficient. The Oil Alert system automatically stops the engine, and the OIL ALERT/CHECK indicator lights. | Turn the MAIN switch OFF, add the proper amount of oil (see page 49), then turn the MAIN switch ON to reset. If the OIL ALERT/CHECK indicator blinks, consult an authorized dealer. | dealer | p. 37 |
| E-01 Error message E-01 (remote control) | During remote control operation, shown if the ENGINE START button is held for more than 10 seconds. The engine stays running and electrical output may stay constant. | Normal remote operation returns after the E-01 message clears automatically. If it does not clear, or any other error message appears, contact an authorized Honda Power Equipment dealer. | dealer | p. 42 |
| batt Low battery message | Shown on the i-Monitor when the ENGINE START button is pressed. Battery voltage is too low to operate the electric starter. | Start the generator with the recoil starter. Have the battery recharged and checked (see page 85). | owner | p. 42 |
Source: official Honda manual, read 2026-11-01. "Owner" means the manual lists steps you can take; "dealer" means it directs you to authorized service. Fuel, gas and electrical work on generators is for qualified technicians; follow the manual's safety section.